I have a tricky data tree operation. I’m using meerkat to get data information for a site modeling. In one tree I get the height values as separate branches (9078 branches). In the other I got the polylines contours of buildings as separate branches (9078 branches). The problem is, there is some duplicate geometries in these polylines countours that I removed and end up with 3291 branches…

How can I keep same number of branches in the polylines countours tree (so 9078) and replacing all the suppressed item with a « null » value ?

I don’t have Meerkat, so I can’t open your definition. But it seems to me that you should just be able to flatten your vector output for your building height and feed it into a List Item component that’s just copied from the last one you have in your polyline filter.